Invalid RSA private key

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Created Sep ’20

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This is my code for generating the token.

Code Block String rsaPrivateKey = "-----BEGIN PRIVATE KEY-----\n" + 
				"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" + 
				"-----END PRIVATE KEY-----";
		 rsaPrivateKey = rsaPrivateKey.replace("-----BEGIN PRIVATE KEY-----", "");
		  rsaPrivateKey = rsaPrivateKey.replace("-----END PRIVATE KEY-----", "");
		  PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.getMimeDecoder().decode(rsaPrivateKey));
		  KeyFactory kf = KeyFactory.getInstance("RSA");
		  PrivateKey privKey = kf.generatePrivate(keySpec);
		
		String token = Jwts.builder()
				.setHeaderParam(JwsHeader.ALGORITHM,"ES256")
				.setHeaderParam(JwsHeader.KEY_ID,"ABC123DEFG" ) // key id I got from Apple
        .setIssuer("DEF123GHIJ")
        .setAudience("https://appleid.apple.com")
        .setSubject("com.mytest.app") // app id com.app.id
        .setExpiration(new Date(System.currentTimeMillis() + expiration))
        .setIssuedAt(new Date(System.currentTimeMillis()))
        .signWith(SignatureAlgorithm.ES256, privKey) // ECDSA using P-256 and SHA-256
        .compact();

but I get following error:

Code Block Exception in thread "main" java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: Invalid RSA private key
	at sun.security.rsa.RSAKeyFactory.engineGeneratePrivate(RSAKeyFactory.java:217)
	at java.security.KeyFactory.generatePrivate(KeyFactory.java:372)
	at com.rjil.cloud.drive.utils.AppleCodeGenerator.main(AppleCodeGenerator.java:35)
Caused by: java.security.InvalidKeyException: Invalid RSA private key
	at sun.security.rsa.RSAPrivateCrtKeyImpl.parseKeyBits(RSAPrivateCrtKeyImpl.java:214)
	at sun.security.pkcs.PKCS8Key.decode(PKCS8Key.java:343)
	at sun.security.pkcs.PKCS8Key.decode(PKCS8Key.java:356)
	at sun.security.rsa.RSAPrivateCrtKeyImpl.<init>(RSAPrivateCrtKeyImpl.java:91)
	at sun.security.rsa.RSAPrivateCrtKeyImpl.newKey(RSAPrivateCrtKeyImpl.java:75)
	at sun.security.rsa.RSAKeyFactory.generatePrivate(RSAKeyFactory.java:316)
	at sun.security.rsa.RSAKeyFactory.engineGeneratePrivate(RSAKeyFactory.java:213)
	... 2 more
Caused by: java.io.IOException: Version must be 0
	at sun.security.rsa.RSAPrivateCrtKeyImpl.parseKeyBits(RSAPrivateCrtKeyImpl.java:192)
	... 8 more

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Answer 1

yingcai OP

Jul ’21

searching long time long time long time, I knew the answer....

TO: https://blog.csdn.net/yuanjian0814/article/details/106805675

MAVEN dependency: io.jsonwebtoken jjwt 0.9.1

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